CN101986718B - Passive optical network (PON) system as well as optical line terminal (OLT) and wavelength route unit in passive optical network (PON) - Google Patents
Passive optical network (PON) system as well as optical line terminal (OLT) and wavelength route unit in passive optical network (PON) Download PDFInfo
- Publication number
- CN101986718B CN101986718B CN201010547331.9A CN201010547331A CN101986718B CN 101986718 B CN101986718 B CN 101986718B CN 201010547331 A CN201010547331 A CN 201010547331A CN 101986718 B CN101986718 B CN 101986718B
- Authority
- CN
- China
- Prior art keywords
- wavelength
- optical
- wdm
- optical signal
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0282—WDM tree architectures
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0228—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths
- H04J14/023—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON]
- H04J14/0232—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON] for downstream transmission
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
- H04J14/0246—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU using one wavelength per ONU
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
- H04J14/0247—Sharing one wavelength for at least a group of ONUs
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
- H04J14/025—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU using one wavelength per ONU, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0261—Optical medium access at the optical multiplex section layer
- H04J14/0265—Multiplex arrangements in bidirectional systems, e.g. interleaved allocation of wavelengths or allocation of wavelength groups
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J2014/0253—Allocation of downstream wavelengths for upstream transmission
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses a passive optical network (PON) system as well as an optical line terminal (OLT) and a wavelength route unit in the PON, which has lower optical line terminal cost and is convenient to realize. The OLT comprises a seed light source module, a high speed optical transmitter module, a first wavelength division multiplex (WDM), an optical circulator (OC), an arrayed waveguide grating (AWG) and n-numbered optical receivers, wherein in the downlink direction, the seed light source module outputs a seed light containing n-numbered wavelengths to the first WDM; the high speed optical transmitter module outputs a high speed time division multiplex downlink optical signal of single wavelength to the first WDM; after carrying out wave combination on the seed light and the high speed time division multiplex downlink optical signal, and then the first WDM inputs the combined wave to the first port of the OC; the OC outputs the high speed time division multiplex downlink optical signal and the seed light through a second port; and in the uplink direction, after the OC receives a multi-wavelength uplink light signal through the second port, the light signal is output to the AWG through the third port of the OC; and wavelength demodulation multiplexing is carried out on the uplink light signal by the AWG, and then light signals with different wavelengths are input into the corresponding optical receiver.
Description
Technical field
The present invention relates to optical access network communication field, relate in particular to optical line terminal and wavelength routing unit in passive optical network and system.
Background technology
EPON (Passive Optical Network, PON) is current FTTX scheme a kind of mainstream technology of (referring to a series of smooth access technologies such as Fiber to the home, Fiber-To-The-Building, Fiber To The Curb).Current EPON is mainly based on time-multiplexed EPON (Time Division Multiplexing-Passive Optical Network, TDM-PON).TDM-PON up-downgoing all adopts single wavelength, very low to the utilance of wavelength bandwidth.Along with people are for the improving constantly of bandwidth demand, this TDM-PON Access Network form based on single wavelength will inevitably run into bottleneck.
Wave division multiplexing passive optical network (Wavelength Division Multiplexing-Passive Optical Network, WDM-PON) be a kind of novel passive optical network system based on the transmission of multi-wavelength single fiber being recently suggested, operation principle is, each terminal use takies separately a wavelength channel, and multiple wavelength channels transmit in same trunk fiber by the mode of wavelength division multiplexing.Be characterized in that each terminal use exclusively enjoys a wavelength bandwidth resource.This not only makes the bandwidth that offers individual consumer greatly improve, and takes full advantage of the wavelength bandwidth resource of optical fiber, has greatly expanded the total bandwidth of EPON.In addition, the upper and lower provisional capital of WDM-PON system requirements is used multi-wavelength transmission.Because upward signal just makes a distinction from physical link mutually by wavelength, so just thoroughly stop the generation of " rogue ONU " phenomenon.
For upward signal, the common recognition of general industry is to adopt " colourless " ONU technology, and reflection-type colorless ONU and wavelength adjustable type colorless ONU are the technology that realizes colorless ONU of two kinds of main flows.Reflection-type colorless ONU is mainly divided into reflective semiconductor optical amplifier (RSOA) and two kinds of implementations of injection locking formula F-P laser.
For downstream signal, it is descending that common WDM-PON system adopts multi-wavelength's Distributed Feedback Laser to realize multi-wavelength, and the mode that also has employing seed light to inject RSOA/FP-LD realizes.But with regard to current technical merit, no matter which kind of scheme, due to for each downstream wavelength passage, all need the optical sender of the different wave length that has a separate modulation, and require when many when number of users, often needing to use the optical device of dense wave division multipurpose, cost is very high.Therefore sizable application and universal the having difficulties of WDM-PON system have been caused.
Summary of the invention
The technical problem to be solved in the present invention is to provide optical line terminal and the wavelength routing unit in passive optical network and system, is preventing rogue ONU, is guaranteeing, under the prerequisite of the high upstream and downstream bandwidth of user, to have reduced local side apparatus cost, and realizing conveniently.
For solving the problems of the technologies described above, the invention provides a kind of optical line terminal (OLT), comprise: seed light source module, high-speed light transmitter module, first wave division multiplexer (WDM), optical circulator, array waveguide grating (AWG) and n optical receiver, wherein:
At down direction, described seed light source module is the seed light containing n wavelength to a described WDM output packet, described high-speed light transmitter module is to the high-speed time-division multiplex downlink optical signal of a described WDM output single wavelength, a described WDM closes after ripple the described seed light and the described high-speed time-division multiplex downlink optical signal that receive, inputs the first port of described optical circulator; Described optical circulator is exported the described high-speed time-division multiplex downlink optical signal from the first port input and seed light by the second port;
At up direction, when described optical circulator receives the uplink optical signal of multi-wavelength from described the second port, export described AWG to by the 3rd port on it, described AWG carries out, after wavelength (de) multiplexing, the light signal of different wave length being inputted respectively to corresponding optical receiver to described uplink optical signal.
For solving the problems of the technologies described above, the present invention also provides a kind of passive optical network, described passive optical network downstream signal adopts time division multiplexing mode, upward signal adopts wave division multiplex mode, described system comprises: OLT (optical line terminal), the ODN (Optical Distribution Network) and n the reflection-type ONU (optical network unit) that are linked in sequence, wherein said OLT is above-mentioned OLT.
For solving the problems of the technologies described above, the present invention also provides a kind of optical line terminal (OLT), comprise: high-speed light transmitter module, first wave division multiplexer (WDM), array waveguide grating (AWG) and n optical receiver, wherein:
At down direction, described high-speed light transmitter module is to the high-speed time-division multiplex downlink optical signal of a described WDM output single wavelength, and a described WDM exports the described high-speed time-division multiplex downlink optical signal receiving by trunk fiber;
At up direction, when a described WDM receives after the uplink optical signal of n the wavelength of being inputted by trunk fiber, input to described AWG, described AWG carries out after wavelength (de) multiplexing described uplink optical signal, inputs respectively n optical receiver.
For solving the problems of the technologies described above, the present invention also provides a kind of passive optical network, described passive optical network downstream signal adopts time division multiplexing mode, upward signal adopts wave division multiplex mode, described system comprises: OLT (optical line terminal), the ODN (Optical Distribution Network) and n the wavelength adjustable type ONU (optical network unit) that are linked in sequence, wherein said OLT is above-mentioned OLT.
For solving the problems of the technologies described above, the present invention also provides a kind of passive optical network, described passive optical network downstream signal adopts time division multiplexing mode, upward signal adopts wave division multiplex mode, described system comprises: OLT (optical line terminal), the ODN (Optical Distribution Network) and m+n the ONU (optical network unit) that are linked in sequence, wherein, described ONU comprises m reflection-type ONU and n wavelength adjustable type ONU, wherein:
Described OLT comprises: seed light source module, high-speed light transmitter module, first wave division multiplexer (WDM), optical circulator, and array waveguide grating (AWG) and m+n optical receiver, wherein:
At down direction, described seed light source module is the seed light containing n wavelength to a described WDM output packet, described high-speed light transmitter module is to the high-speed time-division multiplex downlink optical signal of a described WDM output single wavelength, a described WDM closes after ripple the described seed light and the described high-speed time-division multiplex downlink optical signal that receive, inputs the first port of described optical circulator; Described optical circulator is exported the described high-speed time-division multiplex downlink optical signal from the first port input and seed light by the second port;
At up direction, when described optical circulator receives the uplink optical signal of m+n wavelength from described the second port, export described AWG to by the 3rd port on it, described AWG carries out, after wavelength (de) multiplexing, the light signal of different wave length being inputted respectively to corresponding optical receiver to described uplink optical signal.
For solving the problems of the technologies described above, the present invention also provides a kind of wavelength routing unit, comprises a WDM, intensive wavelength multiplexing demodulation multiplexer, optical splitter and n the 2nd WDM; Wherein:
At down direction, after the seed light that a described WDM receives the high-speed time-division multiplex downlink optical signal of single wavelength and comprises n wavelength, the seed light of the described n of a comprising wavelength is inputed to described intensive wavelength multiplexing demodulation multiplexer, by the high-speed time-division multiplex downlink optical signal input optical splitter of described single wavelength; Described intensive wavelength multiplexing demodulation multiplexer is inputted respectively the 2nd corresponding WDM by described seed light by wavelength, described optical splitter carries out light splitting to described high-speed time-division multiplex downlink optical signal simultaneously, input respectively n the 2nd WDM, each the 2nd WDM exports after the seed light of the described high-speed time-division multiplex downlink optical signal receiving and corresponding wavelength is closed to ripple;
At up direction, described n the 2nd WDM receives respectively after the uplink optical signal of n wavelength, the uplink optical signal of this n wavelength is inputed to described intensive wavelength multiplexing demodulation multiplexer, described intensive wavelength multiplexing demodulation multiplexer is inputted a described WDM after the uplink optical signal of a described n wavelength is closed to ripple, and the light signal after ripple is closed in output by a described WDM.
The present invention proposes a kind of time-division wavelength-division hybrid passive optical network system, this system descending adopts time-multiplexed form to replace wavelength division multiplexing, for example, by the optical module in the wavelength-division multiplex system of use high-speed optical module (10Gb/s or 40Gb/s speed) replacement low speed, not only can realize the downlink bandwidth suitable with Wave division multiplexing passive optical network, and greatly reduce cost.The mode of up employing wavelength division multiplexing, one side has thoroughly been stopped the problem of " rogue ONU " in common time division multiplexing EPON.On the other hand, because upward signal has retained continuous mode, the sending and receiving technical difficulty of upward signal is all greatly reduced, also reduced the difficulty of upward signal speed upgrade in the future.
Accompanying drawing explanation
Fig. 1 is the up wavelength-division passive optical network of the downlink time division of the embodiment of the present invention 1 based on reflective colorless ONU schematic diagram;
Fig. 2 is the internal structure schematic diagram of the embodiment of the present invention 1 wavelength routing unit;
Fig. 3 is the downlink time division up wavelength-division passive optical network schematic diagram of the embodiment of the present invention 2 based on wavelength adjustable type colorless ONU;
Fig. 4 is the downlink time division up wavelength-division passive optical network schematic diagrames of the embodiment of the present invention 3 another kinds based on wavelength adjustable type colorless ONU;
Fig. 5 is the up wavelength-division passive optical network of the downlink time division schematic diagram that the embodiment of the present invention 4 has reflective colorless ONU and wavelength adjustable type colorless ONU concurrently;
Fig. 6 a is the internal structure schematic diagram of a kind of seed light source module in the embodiment of the present invention 4;
Fig. 6 b is the internal structure schematic diagram of another kind of seed light source module in the embodiment of the present invention 4.
Embodiment
The invention provides several hybrid passive optical network systems, system descending adopts time division multiplexing mode, up employing wave division multiplex mode.Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated and is it should be noted that, in the situation that not conflicting, the combination in any mutually of the feature in embodiment and embodiment in the application.
The hybrid passive optical network system of the present embodiment, downstream signal adopts time division multiplexing mode, and upward signal adopts wave division multiplex mode.Comprise: OLT (optical line terminal), the ODN (Optical Distribution Network) and n the reflection-type ONU (optical network unit) that are linked in sequence, wherein:
● described OLT comprises: seed light source module, high-speed light transmitter module, first wave division multiplexer (WDM), optical circulator, array waveguide grating (AWG) and n optical receiver;
On down direction, described seed light source module is the seed light containing n wavelength to a described WDM output packet, described high-speed light transmitter module is to the high-speed time-division multiplex downlink optical signal of a described WDM output single wavelength, a described WDM closes after ripple the described seed light and the described high-speed time-division multiplex downlink optical signal that receive, inputs the first port of described optical circulator; Described optical circulator will comprise described high-speed time-division multiplex downlink optical signal and seed light by the second port output from the first port input;
On up direction, when described optical circulator receives from described the second port the uplink optical signal of multi-wavelength of ODN input, export described AWG to by the 3rd port on optical circulator, described AWG carries out, after wavelength (de) multiplexing, the light signal of different wave length being inputted respectively to corresponding optical receiver to described uplink optical signal;
High-speed light transmitter module, an AWG and n optical receiver in OLT can be integrated into an optical transceiver module.Above-mentioned AWG can be that heat sensitive AWG can be also the irrelevant AWG of heat.
● described ODN comprises trunk fiber, wavelength routing unit and multiple branch road optical fiber;
On down direction, described wavelength routing unit receives after the high-speed time-division multiplex downlink optical signal and the seed light that comprises n wavelength of the single wavelength through trunk fiber transmission of OLT output, described seed light is carried out after wavelength (de) multiplexing, press wavelength respectively through n reflection-type ONU of branch road optical fiber input, just the high-speed time-division multiplex downlink optical signal of single wavelength is inputted each reflection-type ONU through branch road optical fiber simultaneously, comprises the seed light of respective wavelength and the high-speed time-division multiplex downlink optical signal of single wavelength to the light of each reflection-type ONU input;
On up direction, described wavelength routing unit, receiving after the light signal of n the wavelength reflecting from described n reflection-type ONU of each branch road optical fiber, carries out after wavelength multiplexing described light signal, after trunk fiber transmission, inputs described OLT.
In the present embodiment, described seed light source can be multi wave length illuminating source or wide spectrum light source.
Preferably, described wavelength routing unit comprises the 2nd WDM, intensive wavelength multiplexing demodulation multiplexer, optical splitter and n the 3rd WDM; Wherein:
On down direction, described the 2nd WDM receives after the high-speed time-division multiplex downlink optical signal and the seed light that comprises n wavelength of single wavelength of described OLT output, the seed light of the described n of a comprising wavelength is inputed to described intensive wavelength multiplexing demodulation multiplexer, by the high-speed time-division multiplex downlink optical signal input optical splitter of described single wavelength; Described intensive wavelength multiplexing demodulation multiplexer is inputted respectively the 3rd corresponding WDM by described seed light by wavelength, described optical splitter carries out light splitting to described high-speed time-division multiplex downlink optical signal simultaneously, input respectively n the 3rd WDM, each the 3rd WDM exports coupled ONU to after the seed light of the described high-speed time-division multiplex downlink optical signal receiving and corresponding wavelength is closed to ripple;
On up direction, described n the 3rd WDM receives respectively after the uplink optical signal of ONU reflection, the uplink optical signal of this n wavelength is inputed to described intensive wavelength multiplexing demodulation multiplexer, described intensive wavelength multiplexing demodulation multiplexer is inputted described the 2nd WDM after the uplink optical signal of a described n wavelength is closed to ripple, and described the 2nd WDM exports the light signal closing after ripple to connect OLT trunk fiber.
Above-mentioned intensive wavelength multiplexing demodulation multiplexer can be the irrelevant array waveguide grating (AAWG) of heat, or is film filter (TFF).The 2nd WDM comprising in above-mentioned wavelength routing unit, intensive wavelength multiplexing demodulation multiplexer, optical splitter and n the 3rd WDM can realize by planar light wave circuit (PLC) chip of a monolithic.
● in the present embodiment, described reflection-type ONU comprises the 4th WDM, reflective semiconductor optical amplifier (RSOA) or injection locking formula F-P laser (Injection Locking F-P LD, IL F-P LD), optical receiver.Wherein, the 4th WDM is for separating the seed light of incident and high-speed time-division multiplex downlink optical signal, high-speed time-division multiplex downlink optical signal is incided to optical receiver, seed light is incided to RSOA or IL F-P LD, RSOA or IL F-P LD utilize the effect of incident seed light, launch identical with incident seed light wavelength and are loaded with the uplink optical signal of data.
Fig. 1 is the downlink time division based on above-described embodiment 1, up wavelength-division passive optical network schematic diagram.In OLT side, the multi-wavelength seed light λ that seed light source sends
u1, λ
u2... λ
um, the wavelength sending with high-speed light transmitter is λ
dtime division multiplexing downstream signal 1 port that closes ripple and incide optical circulator by wavelength division multiplexer WDM, output to trunk fiber from 2 ports of optical circulator.The multi-wavelength uplink optical signal that is loaded with modulation signal of returning from ONU lateral reflection incides 2 ports of optical circulator by trunk fiber, then shines AWG from 3 ports and carry out wavelength (de) multiplexing, then incides array acceptor Rx1-Rx m.
In wavelength routing unit side, descending multi-wavelength seed light is sent to respectively downlink transfer in different branch optical fibers by wavelength routing unit according to wavelength, incides respectively different ONU; High-speed time-division multiplex downstream signal is all assigned to downlink transfer in every branch optical fiber by wavelength routing unit, incides each ONU.On the other hand, the up multi-wavelength signals of the different wave length sending from each ONU incides wavelength routing unit by each branch optical fiber, is then closed ripple to uplink after trunk fiber.
Fig. 2 is the internal structure schematic diagram of above-described embodiment 1 medium wavelength routing unit.Descending light and seed light are from the public port incident of wavelength routing unit as shown in the figure, and after inner WDM device partial wave, multi-wavelength seed light incides intensive wavelength multiplexing demodulation multiplexer (AAWG or TFF).AAWG or TFF assign to multi-wavelength seed light in each different branch optical fiber by wavelength; Down high speed time division multiplexing light signal is by after WDM, incide the public port of an optical splitter (Splitter), optical splitter is all assigned to down high speed time division multiplexing light signal in each branch optical fiber and is gone by luminous power, and the seed light of each wavelength and merit are divided equally the descending light in Hou Mei road and closed after ripple and incided in corresponding branch optical fiber and go by corresponding WDM device.On the other hand, from each branch optical fiber, the uplink optical signal that is loaded with data being reflected by ONU of incident, closes after ripple by AAWG or TFF, then incides uplink in trunk optical fiber by WDM device.
The hybrid passive optical network system of the present embodiment, downstream signal adopts time division multiplexing mode, and upward signal adopts wave division multiplex mode.Comprise: OLT, ODN and n wavelength adjustable type ONU, wherein:
● described OLT comprises: high-speed light transmitter module, a WDM, AWG and n optical receiver; Wherein:
At down direction, described high-speed light transmitter module is to the high-speed time-division multiplex downlink optical signal of a described WDM output single wavelength, and a described WDM inputs described ODN by the described high-speed time-division multiplex downlink optical signal receiving by trunk fiber;
At up direction, when a described WDM receives after the uplink optical signal of n the wavelength of being inputted by trunk fiber, input to described AWG, described AWG carries out after wavelength (de) multiplexing described uplink optical signal, inputs respectively n optical receiver.
High-speed light transmitter module, an AWG and n optical receiver in OLT can be integrated into an optical transceiver module.Above-mentioned AWG can be that heat sensitive AWG can be also the irrelevant AWG of heat.
● described ODN comprises trunk fiber, wavelength routing unit and n branch road optical fiber;
At down direction, wavelength routing unit receives the described high-speed time-division multiplex downlink optical signal through trunk fiber transmission of described OLT output, and it is carried out after light splitting, inputs respectively n wavelength adjustable type ONU;
At up direction, described wavelength routing unit, receiving after the uplink optical signal that described n wavelength adjustable type ONU send, carries out after wavelength multiplexing described uplink optical signal, after trunk fiber transmission, inputs to described OLT.
The wavelength routing unit adopting in the present embodiment is identical with the wavelength routing unit in embodiment 1.
● in the present embodiment, described wavelength adjustable type ONU comprises WDM, TLS (tunable laser) and optical receiver.WDM is for the high-speed time-division multiplex downlink optical signal of incident is input to optical receiver, and TLS is used for the uplink optical signal of launching certain wavelength and being loaded with data.
Fig. 3 is the downlink time division based on above-described embodiment 2, up wavelength-division passive optical network schematic diagram.In OLT side, the wavelength that high-speed light transmitter sends is λ
ddownlink optical signal, incide wavelength division multiplexer WDM, then incide trunk fiber by the ripple port (com port) that closes of WDM, on the other hand, the multi-wavelength upward signal λ of what user's side was sent be loaded with upward signal
u1, λ
u2... λ
umincide the COM port of WDM by trunk fiber, output to AWG from another branch port of WDM and carry out wavelength (de) multiplexing, then incide array acceptor Rx 1-Rx m.
In wavelength routing unit side, time-multiplexed high-speed downstream light signal is all assigned to each branch optical fiber downlink transfer by wavelength routing unit, on the other hand, the up multi-wavelength signals of the different wave length sending from each ONU incides wavelength routing unit by each branch optical fiber, is then closed ripple to uplink after trunk fiber.
Embodiment 3
Because in real world applications, some operator makes any change to original Optical Distribution Network while not wishing to upgrade WDM-PON system, in this case, can adopt system as shown in Figure 4, ONU uses wavelength adjustable type ONU, descending light is directly by optical splitter light splitting, and the upward signal of different wave length closes after ripple by optical splitter, and uplink in trunk fiber is incided in unification.
In the present embodiment, the structure of OLT and ONU is identical with the structure in embodiment 2.Be to adopt optical splitter to replace the wavelength routing unit in embodiment 2 with the difference of embodiment 2.
Described ODN comprises trunk fiber, optical splitter and n branch road optical fiber; At down direction, optical splitter receives the high-speed time-division multiplex downlink optical signal of the single wavelength through trunk fiber transmission of described OLT output, and it is carried out after light splitting, inputs respectively n wavelength adjustable type ONU; At up direction, described optical splitter inputs to described OLT through trunk fiber again after receiving after the light signal of n the wavelength of launching from described n wavelength adjustable type ONU of each shunt optical fiber, described light signal is closed to ripple.
Embodiment 4
As shown in Figure 5, downstream signal adopts time division multiplexing mode to the hybrid passive optical network system of the present embodiment, and upward signal adopts wave division multiplex mode.Comprise: OLT, the ODN being linked in sequence and m+n ONU, comprising m reflection-type ONU and n wavelength adjustable type ONU.
In the present embodiment, in the structure of OLT and embodiment 1, the structure of OLT is similar, and difference is that its optical receiver number is m+n; The structure of wavelength routing unit is identical with the structure of embodiment 1 medium wavelength routing unit.
The difference of the present embodiment and embodiment 1,2,3 is, the type of ONU had both comprised the ONU of reflection-type, comprise again the ONU of wavelength adjustable type, and the ONU that only has reflection-type needs seed light, therefore, the number of wavelengths that the seed light that seed light source module sends in the present embodiment comprises is consistent with the number of reflection-type ONU, and the wavelength that seed light comprises is different from the wavelength of tunable laser transmitting.
Particularly, in the present embodiment:
● described OLT comprises: seed light source module, high-speed light transmitter module, a WDM, optical circulator, an AWG and m+n optical receiver;
At down direction, the seed light source module of OLT is the seed light containing n wavelength to a WDM output packet, high-speed light transmitter module is to the high-speed time-division multiplex downlink optical signal of a WDM output single wavelength, the one WDM closes after ripple the seed light and the described high-speed time-division multiplex downlink optical signal that receive, the first port of input optical circulator; Optical circulator is exported the high-speed time-division multiplex downlink optical signal from the first port input and seed light by the second port;
At up direction, when optical circulator is from the second port receives the uplink optical signal of m+n wavelength, export AWG to by the 3rd port on it, AWG carries out, after wavelength (de) multiplexing, the light signal of different wave length being inputted respectively to corresponding optical receiver to uplink optical signal.
● described ODN comprises trunk fiber, wavelength routing unit and n branch road optical fiber;
At down direction, described wavelength routing unit receives after the high-speed time-division multiplex downlink optical signal and the seed light that comprises n wavelength of the single wavelength through trunk fiber transmission of described OLT output, described seed light is carried out to wavelength (de) multiplexing, light signal to each reflection-type ONU input comprises the seed light of respective wavelength and the high-speed time-division multiplex downlink optical signal of single wavelength, comprises the high-speed time-division multiplex downlink optical signal of single wavelength to the light signal of each wavelength adjustable type ONU input;
At up direction, described wavelength routing unit, receiving after the uplink optical signal of launching from described n ONU of each branch road optical fiber, carries out after wavelength multiplexing described light signal, after trunk fiber transmission, inputs described OLT.
In the present embodiment, seed light source module can have two kinds of implementations, respectively as shown in Fig. 6 a and 6b, if seed light source is made up of multiple-wavelength laser, so only need control output wave long number by the laser opening and closing of direct control respective wavelength passage, referring to Fig. 6 a; If seed light source is such as, to be realized by wide spectrum light source (ASE light source, SLED etc.), so, just need to be at the output of this light source, by external multi-wavelength passage, adjustable variable optical attenuator VOA controls last output wave long number, referring to Fig. 6 b.
One of ordinary skill in the art will appreciate that all or part of step in said method can carry out instruction related hardware by program and complete, described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits.Correspondingly, the each module/unit in above-described embodiment can adopt the form of hardware to realize, and also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Certainly; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (9)
1. a passive optical network, it is characterized in that, described passive optical network downstream signal adopts time division multiplexing mode, upward signal adopts wave division multiplex mode, described system comprises: the optical line terminal (OLT) being linked in sequence, Optical Distribution Network (ODN) and n reflection type optical network element (ONU), wherein said OLT comprises: seed light source module, high-speed light transmitter module, first wave division multiplexer (WDM), optical circulator, array waveguide grating (AWG) and n optical receiver, at down direction, described seed light source module is the seed light containing n wavelength to a described WDM output packet, described high-speed light transmitter module is to the high-speed time-division multiplex downlink optical signal of a described WDM output single wavelength, a described WDM closes after ripple the described seed light and the described high-speed time-division multiplex downlink optical signal that receive, input the first port of described optical circulator, described optical circulator is exported the described high-speed time-division multiplex downlink optical signal from the first port input and seed light by the second port, at up direction, when described optical circulator receives the uplink optical signal of multi-wavelength from described the second port, export described AWG to by the 3rd port on it, described AWG carries out, after wavelength (de) multiplexing, the light signal of different wave length being inputted respectively to corresponding optical receiver to described uplink optical signal,
Described ODN comprises trunk fiber, wavelength routing unit and n branch road optical fiber; At down direction, described wavelength routing unit receives after the high-speed time-division multiplex downlink optical signal and the seed light that comprises n wavelength of the single wavelength through trunk fiber transmission of described OLT output, described seed light is carried out after wavelength (de) multiplexing, press wavelength respectively through n reflection-type ONU of branch road optical fiber input, the high-speed time-division multiplex downlink optical signal of single wavelength is inputted to each reflection-type ONU through branch road optical fiber simultaneously; At up direction, described wavelength routing unit, receiving after the light signal of n the wavelength reflecting from described n reflection-type ONU of each branch road optical fiber, carries out after wavelength multiplexing described light signal, after trunk fiber transmission, inputs described OLT;
Described wavelength routing unit comprises the 2nd WDM, intensive wavelength multiplexing demodulation multiplexer, optical splitter and n the 3rd WDM; Wherein:
At down direction, described the 2nd WDM receives after the high-speed time-division multiplex downlink optical signal and the seed light that comprises n wavelength of single wavelength of described OLT output, the seed light of the described n of a comprising wavelength is inputed to described intensive wavelength multiplexing demodulation multiplexer, by the high-speed time-division multiplex downlink optical signal input optical splitter of described single wavelength; Described intensive wavelength multiplexing demodulation multiplexer is inputted respectively the 3rd corresponding WDM by described seed light by wavelength, described optical splitter carries out light splitting to described high-speed time-division multiplex downlink optical signal simultaneously, input respectively n the 3rd WDM, each the 3rd WDM exports coupled ONU to after the seed light of the described high-speed time-division multiplex downlink optical signal receiving and corresponding wavelength is closed to ripple;
At up direction, described n the 3rd WDM receives respectively after the uplink optical signal of ONU reflection, the uplink optical signal of this n wavelength is inputed to described intensive wavelength multiplexing demodulation multiplexer, described intensive wavelength multiplexing demodulation multiplexer is inputted described the 2nd WDM after the uplink optical signal of a described n wavelength is closed to ripple, and described the 2nd WDM exports the light signal closing after ripple to connect OLT trunk fiber.
2. the system as claimed in claim 1, is characterized in that,
The 2nd WDM in described wavelength routing unit, intensive wavelength multiplexing demodulation multiplexer, optical splitter and n the 3rd WDM realizes by planar light wave circuit (PLC) chip of a monolithic.
3. system as claimed in claim 1 or 2, is characterized in that,
Described intensive wavelength multiplexing demodulation multiplexer is the irrelevant array waveguide grating of heat, or is film filter (TFF).
4. the system as claimed in claim 1, is characterized in that,
Described reflection-type ONU comprises the 4th WDM, reflective semiconductor optical amplifier (RSOA) or injection locking formula F-P laser (IL F-P LD), optical receiver, wherein:
The 4th WDM is for separating the seed light of incident and high-speed time-division multiplex downlink optical signal, high-speed time-division multiplex downlink optical signal is incided to optical receiver, seed light is incided to RSOA or IL F-PLD, and described RSOA or IL F-P LD launch wavelength identical with incident seed light and are loaded with the uplink optical signal of data.
5. a passive optical network, it is characterized in that, described passive optical network downstream signal adopts time division multiplexing mode, upward signal adopts wave division multiplex mode, described system comprises: the optical line terminal (OLT) being linked in sequence, Optical Distribution Network (ODN) and n wavelength adjustable type optical network unit (ONU), wherein said OLT comprises: high-speed light transmitter module, first wave division multiplexer (WDM), array waveguide grating (AWG) and n optical receiver, wherein: at down direction, described high-speed light transmitter module is to the high-speed time-division multiplex downlink optical signal of a described WDM output single wavelength, a described WDM exports the described high-speed time-division multiplex downlink optical signal receiving by trunk fiber, at up direction, when a described WDM receives after the uplink optical signal of n the wavelength of being inputted by trunk fiber, input to described AWG, described AWG carries out after wavelength (de) multiplexing described uplink optical signal, inputs respectively n optical receiver,
Described ODN comprises trunk fiber, wavelength routing unit and n branch road optical fiber; At down direction, described wavelength routing unit receives the described high-speed time-division multiplex downlink optical signal through trunk fiber transmission of described OLT output, and it is carried out after light splitting, inputs respectively n wavelength adjustable type ONU; At up direction, described wavelength routing unit, receiving after the uplink optical signal that described n wavelength adjustable type ONU send, carries out after wavelength multiplexing described uplink optical signal, after trunk fiber transmission, inputs to described OLT; Or,
Described ODN comprises trunk fiber, optical splitter and n branch road optical fiber; At down direction, described optical splitter receives after the high-speed time-division multiplex downlink optical signal of the single wavelength through trunk fiber transmission of described OLT output, and it is carried out after light splitting, inputs respectively n wavelength adjustable type ONU; At up direction, described optical splitter, receiving after the light signal of n the wavelength of launching from described n wavelength adjustable type ONU of each branch road optical fiber, closes after ripple described light signal, after trunk fiber transmission, inputs described OLT; Or,
Described wavelength adjustable type ONU comprises the 4th WDM, tunable laser (TLS) and optical receiver, wherein, described the 4th WDM is for the high-speed time-division multiplex downlink optical signal of incident is input to optical receiver, and described TLS is used for the uplink optical signal of launching certain wavelength and being loaded with data.
6. a passive optical network, it is characterized in that, described passive optical network downstream signal adopts time division multiplexing mode, upward signal adopts wave division multiplex mode, described system comprises: the optical line terminal (OLT), Optical Distribution Network (ODN) and m+n the optical network unit (ONU) that are linked in sequence, wherein, described ONU comprises m reflection-type ONU and n wavelength adjustable type ONU, wherein:
Described OLT comprises: seed light source module, high-speed light transmitter module, first wave division multiplexer (WDM), optical circulator, and array waveguide grating (AWG) and m+n optical receiver, wherein:
At down direction, described seed light source module is the seed light containing n wavelength to a described WDM output packet, described high-speed light transmitter module is to the high-speed time-division multiplex downlink optical signal of a described WDM output single wavelength, a described WDM closes after ripple the described seed light and the described high-speed time-division multiplex downlink optical signal that receive, inputs the first port of described optical circulator; Described optical circulator is exported the described high-speed time-division multiplex downlink optical signal from the first port input and seed light by the second port;
At up direction, when described optical circulator receives the uplink optical signal of m+n wavelength from described the second port, export described AWG to by the 3rd port on it, described AWG carries out, after wavelength (de) multiplexing, the light signal of different wave length being inputted respectively to corresponding optical receiver to described uplink optical signal;
Described ODN comprises trunk fiber, wavelength routing unit and n branch road optical fiber; At down direction, described wavelength routing unit receives after the high-speed time-division multiplex downlink optical signal and the seed light that comprises n wavelength of the single wavelength through trunk fiber transmission of described OLT output, described seed light is carried out to wavelength (de) multiplexing, light signal to each reflection-type ONU input comprises the seed light of respective wavelength and the high-speed time-division multiplex downlink optical signal of single wavelength, comprises the high-speed time-division multiplex downlink optical signal of single wavelength to the light signal of each wavelength adjustable type ONU input; At up direction, described wavelength routing unit, receiving after the uplink optical signal of launching from described n ONU of each branch road optical fiber, carries out after wavelength multiplexing described light signal, after trunk fiber transmission, inputs described OLT.
7. a wavelength routing unit, is characterized in that, comprises a WDM, intensive wavelength multiplexing demodulation multiplexer, optical splitter and n the 2nd WDM; Wherein:
At down direction, after the seed light that a described WDM receives the high-speed time-division multiplex downlink optical signal of single wavelength and comprises n wavelength, the seed light of the described n of a comprising wavelength is inputed to described intensive wavelength multiplexing demodulation multiplexer, by the high-speed time-division multiplex downlink optical signal input optical splitter of described single wavelength; Described intensive wavelength multiplexing demodulation multiplexer is inputted respectively the 2nd corresponding WDM by described seed light by wavelength, described optical splitter carries out light splitting to described high-speed time-division multiplex downlink optical signal simultaneously, input respectively n the 2nd WDM, each the 2nd WDM exports after the seed light of the described high-speed time-division multiplex downlink optical signal receiving and corresponding wavelength is closed to ripple;
At up direction, described n the 2nd WDM receives respectively after the uplink optical signal of n wavelength, the uplink optical signal of this n wavelength is inputed to described intensive wavelength multiplexing demodulation multiplexer, described intensive wavelength multiplexing demodulation multiplexer is inputted a described WDM after the uplink optical signal of a described n wavelength is closed to ripple, and the light signal after ripple is closed in output by a described WDM.
8. wavelength routing unit as claimed in claim 7, is characterized in that,
A WDM in described wavelength routing unit, intensive wavelength multiplexing demodulation multiplexer, optical splitter and n the 2nd WDM realizes by planar light wave circuit (PLC) chip of a monolithic.
9. wavelength routing unit as claimed in claim 7 or 8, is characterized in that,
Described intensive wavelength multiplexing demodulation multiplexer is the irrelevant array waveguide grating of heat, or is film filter (TFF).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010547331.9A CN101986718B (en) | 2010-11-16 | 2010-11-16 | Passive optical network (PON) system as well as optical line terminal (OLT) and wavelength route unit in passive optical network (PON) |
| PCT/CN2011/077919 WO2012065460A1 (en) | 2010-11-16 | 2011-08-02 | Passive optical network system and method, optical line terminal and wavelength routing unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010547331.9A CN101986718B (en) | 2010-11-16 | 2010-11-16 | Passive optical network (PON) system as well as optical line terminal (OLT) and wavelength route unit in passive optical network (PON) |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101986718A CN101986718A (en) | 2011-03-16 |
| CN101986718B true CN101986718B (en) | 2014-06-11 |
Family
ID=43711018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010547331.9A Active CN101986718B (en) | 2010-11-16 | 2010-11-16 | Passive optical network (PON) system as well as optical line terminal (OLT) and wavelength route unit in passive optical network (PON) |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101986718B (en) |
| WO (1) | WO2012065460A1 (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986718B (en) * | 2010-11-16 | 2014-06-11 | 中兴通讯股份有限公司 | Passive optical network (PON) system as well as optical line terminal (OLT) and wavelength route unit in passive optical network (PON) |
| CN103703710B (en) * | 2011-07-29 | 2017-07-04 | 瑞典爱立信有限公司 | Optical access network |
| CN102546005B (en) * | 2011-12-22 | 2014-10-01 | 上海大学 | Passive optical access network system with protecting and bandwidth sharing functions and implementation method thereof |
| CN102412903B (en) * | 2011-12-28 | 2014-07-02 | 重庆朗天通讯股份有限公司 | Novel OLT (optical line terminal) based on XPON (X passive optical network) system |
| CN102833030B (en) * | 2012-08-31 | 2015-05-27 | 烽火通信科技股份有限公司 | TWDM-PON (Time Wavelength Division Multiplexing-Passive Optical Network) ONU (Optical Network Unit) implementation device and method based on cyclical optical tunable filter |
| WO2014063349A1 (en) * | 2012-10-26 | 2014-05-01 | 华为技术有限公司 | Passive optical network communication method and system, and optical line terminal |
| CN103281610A (en) * | 2013-06-19 | 2013-09-04 | 苏州彩云飞电子有限公司 | Multi-wavelength passive optical network system |
| CN103281612A (en) * | 2013-06-19 | 2013-09-04 | 苏州彩云飞电子有限公司 | Method for downlink transmission of multi-wavelength passive optical network system |
| CN103297872A (en) * | 2013-06-19 | 2013-09-11 | 苏州彩云飞电子有限公司 | Multi-wavelength passive optical network system |
| WO2015003144A1 (en) * | 2013-07-05 | 2015-01-08 | Huawei Technologies Co., Ltd. | Optical network unit (onu) wavelength self-tuning |
| CN104023282B (en) * | 2014-05-29 | 2017-05-17 | 烽火通信科技股份有限公司 | Open network architecture based on wavelength division PON system, and signal transmission method |
| CN107547165B (en) * | 2016-06-24 | 2019-07-05 | 中兴通讯股份有限公司 | Optical line terminal, method for transmitting signals and device |
| CN109600167B (en) * | 2018-11-27 | 2021-09-03 | 成都成电光信科技股份有限公司 | Digital array radar optical fiber transmission network and control method thereof |
| CN112564808B (en) * | 2020-12-09 | 2022-01-04 | 武汉邮电科学研究院有限公司 | Uplink burst mode transmission system, equipment and method in coherent passive optical network |
| CN113596634B (en) * | 2021-07-30 | 2023-09-26 | 武汉光迅科技股份有限公司 | Combo PON OLT monolithic integrated chip and optical component thereof |
| CN113905294B (en) * | 2021-10-21 | 2024-09-10 | 武汉恩达通科技有限公司 | Hybrid passive optical network system based on WDM |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034942A (en) * | 2006-12-28 | 2007-09-12 | 上海交通大学 | Network structure for realizing the full-optical virtual private network between more than two passive optical networks |
| CN101079673A (en) * | 2006-05-24 | 2007-11-28 | 中兴通讯股份有限公司 | Wave division and time division passive optical network |
| CN101114885A (en) * | 2007-09-05 | 2008-01-30 | 华中科技大学 | Wavelength-division and time division multiplex mixing passive optical network system, terminal and signal transmission method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101404107B1 (en) * | 2007-12-14 | 2014-06-10 | 한국전자통신연구원 | Optical network system for wireless broadband service |
| WO2009082113A2 (en) * | 2007-12-21 | 2009-07-02 | Electronics And Telecommunications Research Institute | Wavelength division multiplexing-passive optical network using external seed light source |
| CN101986718B (en) * | 2010-11-16 | 2014-06-11 | 中兴通讯股份有限公司 | Passive optical network (PON) system as well as optical line terminal (OLT) and wavelength route unit in passive optical network (PON) |
-
2010
- 2010-11-16 CN CN201010547331.9A patent/CN101986718B/en active Active
-
2011
- 2011-08-02 WO PCT/CN2011/077919 patent/WO2012065460A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101079673A (en) * | 2006-05-24 | 2007-11-28 | 中兴通讯股份有限公司 | Wave division and time division passive optical network |
| CN101034942A (en) * | 2006-12-28 | 2007-09-12 | 上海交通大学 | Network structure for realizing the full-optical virtual private network between more than two passive optical networks |
| CN101114885A (en) * | 2007-09-05 | 2008-01-30 | 华中科技大学 | Wavelength-division and time division multiplex mixing passive optical network system, terminal and signal transmission method |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012065460A1 (en) | 2012-05-24 |
| CN101986718A (en) | 2011-03-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101986718B (en) | Passive optical network (PON) system as well as optical line terminal (OLT) and wavelength route unit in passive optical network (PON) | |
| US11159231B2 (en) | Methods and systems relating to optical networks | |
| US9479284B2 (en) | Discovery method, optical communication method, and optical communication system | |
| JP5883507B2 (en) | Shiftable wavelength division multiplexed passive optical network | |
| US8953942B1 (en) | Hybrid WDM-TDM passive optical network | |
| CN103354625B (en) | The passive light network transmission system of the stacking wavelength-division and time-division multiplexing based on OFDM | |
| US8649682B2 (en) | Passive optical network | |
| US10097907B2 (en) | Systems and methods of wavelength division multiplex passive optical networking | |
| US20060239609A1 (en) | Methods and apparatuses to increase wavelength channels in a wavelength-division-multiplexing passive-optical-network | |
| CN103023559A (en) | WDM-PON (wavelength-division-multiplexing passive optical network) system based on resource sharing protecting mechanism and method for protecting WDM-PON system based on resource sharing protecting mechanism | |
| CN111355554A (en) | Route multiplexer, route multiplexing method, wavelength division routing method and network system | |
| Pagare et al. | Design and analysis of hybrid optical distribution network for worst-case scenario of E2-class symmetric coexistence 80 Gbps TWDM NG-PON2 architecture for FTTX access networks | |
| CN101141346B (en) | Wavelength division multiplexing passive optical network device | |
| Rashed | Optical add drop multiplexer (OADM) based on dense wavelength division multiplexing technology in next generation optical networks | |
| WO2017220040A1 (en) | Optical line terminal, and signal transmission method and device | |
| CN103475955B (en) | Descending DPSK modulation and the mixing TWDM-PON system of up directly modulation | |
| US10645473B2 (en) | All-optical networks based on switchable wavelength connects (SWCs) | |
| Kaur et al. | Entirely passive remote node design and system architecture for bus topology based 80Gbps symmetrical NG-PON2 | |
| CN105743600A (en) | ONU (Optical Network Unit) in symmetrical TWDM-PON (Time and Wavelength Division Multiplexing-Passive Optical Network) system for realizing high speed transmission with low speed optical instrument | |
| Iannone et al. | A 40Gb/s CWDM-TDM PON with a cyclic CWDM multiplexer/demultiplexer | |
| KR100972035B1 (en) | Apparatus for optical filtering and Optical Transmission System | |
| EP2068469B1 (en) | Method for circulating optical signals in a passive optical distribution network | |
| Abd Manaf et al. | Upstream characteristics of tunable WDM-PON system for deployment in Malaysia | |
| EP2894800B1 (en) | Optical interconnection device and method | |
| Stopiński et al. | Photonic integrated circuits for application in WDM-PON |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |